Drinking and domestic water system and shut-off valve therefor

Abstract

The present invention relates to a drinking or process water system with a transfer point (22) from the public water supply network, a line (2, 4) from which at least one ring main (10; 38, 40) equipped with at least one consumer (12) extends, wherein the ring main (10) extends from the line (2, 4) via an outlet opening (14) and is returned to the line (2, 4) via an inlet opening (16), wherein the line (2, 4) and the ring main (10) are parallel and a flow resistance element (36) is arranged in the line (2, 4) between the outlet opening (14) and the inlet opening (16), or wherein the ring main (38, 40) is returned to a circulation line (6) via the inlet opening (16).The present invention aims to simplify the shut-off of the ring line for functional tests, cleaning measures or for maintenance purposes and proposes to connect the outlet opening (14) and the inlet opening (16) and the ring line (10) to a shut-off valve (18, 20) having an actuator (44) which is arranged between the outlet opening (14) or the inlet opening (16) and the ring line (10) which is provided with the at least one consumer (12).The shut-off valve according to the invention has a housing (42) which has a first line-side connection (58) communicating with the outlet opening (14), a second line-side connection (60) communicating with the inlet opening (16), a first ring-side connection (62) and a second ring-side connection (64), and an actuator (44) which is arranged and configured in the housing (42) such that, depending on the position of the actuator (44) in the housing (42), a first and a second flow path (70, 76) are formed between the line-side and ring-side connections (58, 62; 60, 64), or bypass paths (76; 78) are formed through the housing (42), so that two connections (58, 60; 62, 64) are connected to each other, whereas other connections (62, 64; 58, 60) are blocked, or one of the flow paths (70, 76) is open and the other of the flow paths (76, 70) is blocked.

Description

[0001] The present invention relates to a drinking or service water system with a transfer point from a public drinking water supply network and with at least one floor or riser pipe line and, as a rule, several lines arranged one behind the other in the direction of extension of the line and each leading to at least one withdrawal point, which lines branch off from the line.

[0002] A generic drinking and service water system is known, for example, from EP 1 845 702 A1.

[0003] This previously known system - as well as the system according to the present invention - is based on the idea that different consumers can be supplied via a single line. This line is a floor or riser line. The riser line usually runs through several floors and is generally strictly straight. The same applies to the floor line. This runs horizontally on one floor and supplies several consecutive wet rooms or apartments. In order to provide drinking and service water to one of the consumers with as little loss as possible, unnecessary diversions from the transfer point to the consumer are usually avoided. Each of the lines is laid as straight as possible. This enables the respective consumers to be supplied with a good line pressure. In this way, relatively high volume flows can be achieved at the respective consumer.With regard to drinking water hygiene, it is preferable to connect at least one consumer, preferably several consumers, for example, a wet room, via a ring main. This ring main branches off from the branch via an outlet opening and is returned to the branch via an inlet opening. A flow resistance element is provided in the branch between the inlet and outlet openings. This flow resistance element causes a certain flow through the ring main when water flows through the branch when water is drawn from a consumer located downstream of the corresponding ring main. The flow resistance can create a Venturi effect at the inlet opening.The flow resistance element can also simply increase the flow resistance in the line to the extent that a certain partial flow flows through the ring line, which is significantly longer and thus has a higher flow resistance than the section of the line between the outlet and inlet openings. Thus, when water is drawn from a downstream consumer, the flow through the ring line is parallel to the line and thus flushed.

[0004] The flow resistance element can be a statically constructed flow resistance element, as is known, for example, from EP 1 845 702 A1. The flow resistance element can also be implemented in a ring line flushing valve, which forms the inlet opening and the outlet opening as well as two usually opposite openings for the branch flow. The flow resistance element can also be a flow resistance element that dynamically adapts to the pressure conditions, as described in EP 2 167 740 A1. In this prior art, a full-flow shut-off valve is located directly adjacent to the outlet opening. Another full-flow shut-off valve is provided immediately upstream of the outlet opening. The two shut-off valves can be used to shut off the ring line for maintenance or during installation and to separate it from the general distribution network of the drinking and domestic water system.The ring line can also be functionally tested using the corresponding full-flow shut-off valves.

[0005] Ring lines within the meaning of the present invention can also be understood as an annular piping in which a hot water supply line branches off from an outlet opening of a hot water supply line to at least one, usually to several, consumers, which is returned via an inlet opening and connected via this to another line, which is referred to below as a circulation line. Such piping is usually implemented to supply a wet room with a hot water supply line laid within the wet room and a hot water circulation line laid within the wet room, into which the hot water supply line usually merges within the wet room and which has a smaller nominal diameter than the hot water supply line.

[0006] The installation work for these two shut-off valves is considerable. In addition, the user is often unable to trace the respective valve position. Incorrect use of the shut-off valves can lead to insufficient flow or stagnation, particularly within the ring main. One of the shut-off valves can be closed and the other open without this necessarily leading to a perception of a fault, since in this case the consumer in the ring main is supplied through the open shut-off valve. It makes no difference whether the opening in the ring main that allows the consumer to be supplied is the inlet opening or the outlet opening. The pressure difference that occurs when the consumer draws water always leads to a flow of water towards the consumer, so that water can be drawn off via this.

[0007] Furthermore, the valves must be accessible, so appropriate access ports or inspection hatches must be provided for the number of valves. Installing these valves in apartments will compromise the aesthetic appearance of at least the area from which the shut-off valves are to be accessible.

[0008] The present invention aims to provide a drinking and service water system of the type mentioned above that is designed to eliminate misuse as much as possible and increase the traceability of operation and, above all, installation. It is also intended to simplify the shutoff of the ring line for functional tests, cleaning measures, or maintenance purposes.

[0009] In view of this, the present invention proposes connecting the outlet opening and the inlet opening as well as the ring line to a single shut-off valve. This single shut-off valve has an actuator for adjusting valve positions. The shut-off valve is located between the outlet opening and the inlet opening and the ring line having the at least one consumer. Typically, no consumer is provided between the shut-off valve and the branch. The shut-off valve connects as directly as possible to the branch and the outlet and inlet openings provided there. The shut-off valve is preferably located at a location corresponding to the full-flow shut-off valves according to EP 2 167 740 A1. The shut-off valve can, for example, be implemented as a structural unit with a ring line flushing valve and sold with this.The outlet and inlet openings formed by such a ring line flushing valve are adapted in terms of their relative spacing to branch-side connections arranged on a housing of the shut-off valve, which accommodates and movably supports the actuator. A direct connection can thus be established between these branch-side connections and the outlet opening or the inlet opening, for example, through fittings or mutually associated screw connections. The actuator is adjusted in such a way that at least the positions known from the prior art are possible, in which the ring line can be flowed through via the outlet opening and the inlet opening with the lowest possible flow resistance within the shut-off valve, or in which the ring line is shut off from the branch. These two valve positions can usually be achieved by operating the single actuator of the shut-off valve.This simplifies handling. Furthermore, only one access point for the shut-off valve needs to be created from the outside, which improves the aesthetic requirements of the space providing access to the shut-off valve. Since only a single shut-off valve needs to be operated or set by the user, the respective operating status of the shut-off valve can be communicated to the user through appropriate markings on the housing and / or the actuator. Misuse is thus largely eliminated. The respective operating status of the shut-off valve is immediately apparent to the user.

[0010] "Isolated" means that a blocked port within the shut-off valve is not fluidly connected to any other port of the shut-off valve. The valve positions, usually all valve positions, are usually achieved by positioning the shut-off valve's sole actuator and / or by manipulating the sole actuator.

[0011] The housing of the shut-off valve usually has a first branch-side connection that communicates with the outlet opening. The housing further has a second branch-side connection that communicates with the inlet opening. The housing also has a first ring-line side connection and a second ring-line side connection. The ring line branches off from these two ring-line side connections. In other words, the ring line is connected to the housing via the two ring-line side connections. The actuator is preferably arranged and designed in the housing such that an operating position of the actuator and a bypass position of the actuator can be set. In the operating position of the actuator, a first flow path is formed in the housing, which connects the first branch-side connection to the first ring-side connection.In this operating position, a second flow path is also formed in the housing, connecting the second branch-side connection to the second ring line-side connection. In the operating position, this creates a flow through the ring line with a parallel flow acting in the branch, as is the case with open full-flow shut-off valves in the prior art.

[0012] To ensure the least possible loss of flow through the shut-off valve, the first flow path is preferably configured with the nominal diameter of the first branch-side connection and the first ring-line connection. The second flow path is preferably configured with the nominal diameter of the second branch-side connection and the second ring-line connection. Accordingly, in the operating position, full flow through the shut-off valve is preferably enabled.

[0013] The actuator is further preferably arranged and designed in the housing such that, when the actuator is in a bypass position, a first bypass path is formed in the housing, which connects the first branch-side connection to the second branch-side connection. The first and second ring-line side connections are blocked off. The bypass position accordingly enables a bypass flow from the outlet opening to the inlet opening, bypassing the ring line, which is thus accessible for maintenance purposes, for example, without the entire drinking and service water system having to be depressurized. At typical flow velocities in the branch, the flow through the bypass path is limited to less than 3 liters / minute. The bypass position also allows water to be drawn from a consumer downstream of the ring line in the branch.

[0014] In addition to the operating position and the bypass position, the actuator, due to its design and arrangement in the housing, preferably enables further operating positions, namely a first one-sided operating position in which the first flow path is open and the second flow path is closed, and a second one-sided operating position in which the second flow path is open and the first flow path is closed. Each of these one-sided operating positions enables functional checks and cleaning measures to be carried out within the ring main or a specific section of the ring main, since the incoming flow can only flow from the branch into the ring main from one direction.

[0015] Preferably, the actuator can be arranged and configured in the housing such that, in a ring line bypass position of the actuator, a second bypass path is formed in the housing, connecting the first ring line-side connection to the second ring line-side connection. In this ring line bypass position, the first and second branch-side connections are blocked. Such a ring line bypass position can be useful for the purpose of functional testing of the ring line itself or for cleaning measures within the ring line.

[0016] The present invention enables various designs, each of which allows for reduced installation space in one dimension. Both variants are based on the actuator being cylindrical and pivotably accommodated in the housing. In the first variant, the connections and / or formations of the actuator, which form various passages between the connections depending on the position of the actuator, are arranged essentially in a plane extending transversely to a pivot axis of the actuator. In this plane, the corresponding connections are distributed around the circumference of the housing. The housing accordingly has a relatively large base area with a shallow depth. Depth here is understood to be the extension along the pivot axis. Such a design can be useful for a relatively thin wall that is intended to accommodate the shut-off valve.

[0017] For other requirements, and in particular when there is little installation space in the plane of the corresponding wall, a different design is preferable in which the actuator has two through-bores arranged one behind the other in a direction extending along the pivot axis of the actuator, which through-bores form the first flow path and the second flow path respectively. Alternatively or additionally, in this variant the first branch-side connection can be provided behind or in front of the second branch-side connection in a direction extending along the pivot axis of the actuator. A corresponding arrangement is preferably specified for the two ring line-side connections. The connections to the ring line or the connections to the branch and / or the connections required to form the first orAccordingly, the through-holes provided for the second flow path are arranged one behind the other when viewed from above the wall, corresponding to a view of the pivot axis of the actuator. Typically, the corresponding connections or through-holes are also arranged strictly one behind the other in the direction of this pivot axis. Accordingly, a branch-side connection is located directly in front of or behind the second branch-side connection along the pivot axis. The same applies to the ring line-side connections. The branch-side connections are preferably located diametrically opposite the ring line-side connections, so that the through-holes can be recessed as straight holes within the actuator, thereby reducing the flow resistance within the shut-off valve.

[0018] According to a preferred embodiment of the present invention, the actuator comprises an expansion element associated with at least one of the flow paths. This expansion element allows the flow through the corresponding flow path to be throttled depending on the temperature. The expansion element is exposed to the temperature of the flowing drinking or service water. It can thus limit the flow through the shut-off valve depending on the temperature.

[0019] This makes the shut-off valve also suitable for hydraulic balancing in a hot or cold water system. With multiple shut-off valves, each assigned to a ring line, the expansion element provides temperature-dependent throttling to the respective ring line depending on the prevailing temperature. In a hot water system, the expansion element can ensure that, when the water in the ring line is sufficiently warm, the flow through the corresponding ring line is further throttled or even shut off via the expansion element.In a cold water system, the expansion element can set an appropriately cold temperature and, if the water temperature in the ring main is appropriately cold, can throttle the flow in it more or even stop it. If the cold water temperature is too high, the expansion element opens more and thus ensures a better exchange of the warm, presumably stale cold water, so that it can be pumped out of the ring main via the ring main flow.

[0020] Thus, according to a preferred embodiment of the present invention, a shut-off valve suitable for a drinking and service water system of the type mentioned above is also protected. This shut-off valve can be arranged near a branch to connect a ring line that branches off from the branch and returns to the branch, allowing flow passages through the various positions.

[0021] Further advantages and details of the present invention will become apparent from the following description of an embodiment in conjunction with the drawings, in which: Figure 1 shows a schematic view of a first embodiment of a drinking and service water system; Figure 2 shows a schematic representation of a second embodiment of a drinking and service water system, wherein only the cold water pipes are shown; Figure 3 shows a section of an embodiment of a drinking and / or service water system, wherein only a part of the hot water supply is illustrated; Figure 4 shows an exploded view of a first embodiment of a shut-off valve; Figures 5a-5d show sectional views of various positions of the actuator of the embodiment according to Figur 4; Figures 6a-6d show a schematic perspective side view of a second embodiment of a shut-off valve in different positions of the actuator; Figures 7a-7d show sectional views of the positions 6a to 6d and Figure 8 shows a variant of the Figuren 7a-d shown shut-off valve in a position according to Figur 7a with an expansion element.

[0022] The Fig. 1 The embodiment shown illustrates a drinking and service water installation using the example of a hotel or hospital. On a schematically shown floor, a cold water line 2 runs, and parallel to this, a hot water line 4 and a hot water circulation line 6 are provided. Each wet room 8 has a ring line 10 for cold water, which is connected to the cold water line 2. Each ring line 10 has several consumers 12, whose connections to the concealed embodiments are shown in the Figuren 1 bis 3are schematically marked with a dot. The consumers 12 can be a toilet, a shower, a bathtub, or a hand basin. These consumers 12 are connected in series in the ring line 10.

[0023] The ring line 10 branches off from the cold water line 2 via an outlet opening 14 and flows into this line 2 via an inlet opening 16. The outlet opening 14 of each individual ring line is located upstream of the inlet opening 16 in the direction of flow (arrow S shown in the cold water line 2). Shut-off valves 18 are provided at the beginning of each ring line 10 and near the line 2, accessible from the hallway or the respective wet room 8. These shut-off valves can be used to isolate the connected ring line 10 from the cold water line 2, for example, to carry out installation work on the corresponding ring line 10. The shut-off valves 20 for connecting the wet room 8 to the hot water line 4 and the hot water circulation line 6 are also located at the same location.

[0024] In Fig. 2Cold water pipes of a drinking water system in a multi-story building, such as a hospital, are shown. On each floor, water pipes can be installed according to the illustrations in Fig. 1 The cold water pipe system has a transfer point 22 from the public drinking water supply network, a vertically extending riser 24, from which a horizontally running floor line 2 branches off on each floor, a vertically running connecting line 26, which is connected to the individual floor lines 2 via a controllable valve 28 and leads via a likewise controllable flush valve 30 to a discharge point 32 for used water to the public sewage disposal network. The individual cold water floor lines 2 run horizontally and one above the other. One line 2 is provided on each floor. Fig. 2In the second embodiment shown, each strand 2 has six ring lines 10, which lead from the individual strands 2 via outlet openings 14 and inlet openings 16 or are led back into them.

[0025] The outlet opening and the inlet opening to a single ring line 10 can be connected via a ring line flushing valve 34 having a flow resistance element 36 within it. This ring line flushing valve 34 can be designed according to EP 1 845 207 A1 or EP 2 167 740 A1.

[0026] The Figur 3shows a schematic of the connection of a wet room 8 to the hot water supply and circulation system. A hot water supply line 38 branches off from the hot water line 4 and is routed to the last consumer 12, in this case a shower. Behind this shower, the hot water supply line 38 merges into a hot water circulation line 40 with a smaller nominal diameter than the hot water supply line 38, which opens into the hot water circulation line 6. The hot water line 4 and the hot water circulation line 6 are laid parallel to each other as vertical risers 24. In this case, the hot water line 4 branches off from a hot water generator located in the basement. The hot water circulation line 6 leads to this hot water generator. The hot water supply line 38 and the hot water circulation line 40 form a ring line 10 in the sense of the present invention. These lines 38, 40 are each connected to the shut-off valve 20.

[0027] The Figure 1 and 3 The shut-off valves marked with reference numerals 18 and 20 and shown there only schematically can be described as follows with reference to the Figure 4 ff explained.

[0028] Figur 4 shows a housing 42 of the shut-off valve 18 / 20, in which an actuator 44 is pivotably mounted about a pivot axis 46. The actuator 44 has a substantially cylindrical valve body 48 and an actuating pin 50 projecting centrally therefrom.

[0029] As in particular the Figuren 5a bis d To illustrate, the valve body 48 has two formations in the form of concave depressions on its outer peripheral surface, of which Figur 4 only the shape referred to below as the first concave depression 52 can be seen. The other, second concave depression 54 is in the Figuren 5a bis d recognizable.

[0030] The actuator 44 is accommodated in the housing 42, covered by a housing cover 56, in a pivotable and sealed manner, so that different flow passages can be created within the housing 42, which will be discussed below.

[0031] In the following figures, reference numeral 58 denotes a first strand-side connection that is to be connected to the outlet opening 14. Reference numeral 60 denotes a second strand-side connection that is connectable to the inlet opening 16.

[0032] Depending on the position of the actuator 44, different passages can be created through the housing 42 of the shut-off valve 18 or 20 via these connections 58 to 64.

[0033] The Figur 5aclarifies the operating position. In this position, the first concave trough 52 connects flow sections 66, 68 formed in the housing 42 to form a first flow path 70, which connects the first branch-side connection 58 to the first ring-line-side section 62. The second concave trough 54 connects corresponding flow sections 72, 74 to form a second flow path 76. In this operating position, the ring line 10 can be flowed through with the full-flow shut-off valves open, as in the prior art. The flow sections 68, 70, 72, 74 and the two concave troughs 52, 54 are designed such that the first flow path 70 and the second flow path 76, respectively, have the nominal diameter of the respective connections 58, 60, 62, 64. In this case, all connections 58, 60, 62, 64 are realized with the same nominal diameter.In the case of a shut-off valve 20 for the hot water circulation, the connections 60, 64 and the second flow channel 76 connecting them can also be realized with a smaller nominal diameter, which corresponds to the nominal diameter of the hot water circulation line 40.

[0034] The Figur 5b illustrates a bypass position of the actuator 44. In this bypass position, the actuator 44 is opposite the operating position according to Figur 5a pivoted clockwise by approximately 80°. The first concave trough 52 connects the flow section 66 to the flow section 72, thereby forming a first bypass path that connects the first branch-side connection 58 to the second branch-side connection 60. The two ring line-side connections 62, 64 are blocked by the actuator 44.

[0035] In Figur 5c the actuator 44 is rotated by a further approximately 90° relative to the first bypass position according to Figur 5bclockwise. In the further operating position Figur 5d the actuator 44 is pivoted clockwise by a further approximately 60°. In the first one-sided operating position of the actuator 44 according to Figur 5d This results in a continuous first flow path 70, whereas the second flow path 76 is blocked. After this, the second branch-side connection 60 and the second ring line-side connection 64 are blocked. Figur 5c The operating position shown is the second one-sided operating position in which the second flow path 76 is continuous and the first flow path 70 is blocked.

[0036] In the embodiment according to the Figuren 5a bis d all connections 58, 60, 62, 64 and the formations 52, 54 of the actuator 44 are located on a plane that extends at right angles to the pivot axis 46.

[0037] In the embodiment according to the Figuren 6a.1 bis 6d.3Identical components are identified by the same reference numerals as in the previous example. A cylindrical actuator 44 is pivotably mounted about a pivot axis 46 in a housing 42, which is also schematically shown to be cylindrical on the outer circumference. On the outer circumference of the housing 42, the first strand-side connection 58 and the second strand-side connection 60 are provided one above the other in the direction of extension of the pivot axis 46 (cf. Figur 6a.3 ). In the same way, the first ring line-side connection 62 and the second ring line-side connection 64 are provided one above the other (cf. Figur 6a.1 ). The Figur 6a.2 reveals through holes 80, 82, which are also arranged one above the other in the direction of extension of the pivot axis 46. In the operating position according to Figur 6a.1 bis 6a.3 and Figur 7aThe through-bore 80 is aligned with the first branch-side connection 58 and the first ring-line-side connection 62. The second through-bore 82 is aligned with the second branch-side connection 60 and with the second ring-line-side connection 64. This creates continuous first and second flow channels 70, 76. The diameters of the connections 58, 60, 62, 64 and the through-bores 80, 82 are identical in this case.

[0038] The Figuren 6b.1 bis 6d.3 show the other operating positions of the actuator 44. In addition to through holes, the valve body also has recesses, some of which are shown in the figures.

[0039] Figur 6b.1 bis 6b.3 and Figur 7b shows the bypass position of the actuator 44, in which the first string-side connection 58 is short-circuited with the second string-side connection 60 via a first concave recess 52 which is recessed on the outer circumference of the actuator 44. Figur 6b.1shows a short circuit of the first ring line-side connection 62 with the second ring line-side connection 64 via a second concave trough 54. Figure 6b shows the bypass position of the actuator 44 as well as the ring line bypass position of the actuator 44, which in the present case is realized with a single position of the actuator 44.

[0040] The Figuren 6c.1 bis 6c.3 and Figur 7cillustrate the first one-sided operating position of the actuator 44, in which the first branch-side connection 58 and the second branch-side connection 62 communicate with each other via a transverse bore 84 within the actuator 44, while the respective second connections 60, 64 are routed through the actuator 44. The second branch-side connection 62 and the second ring line-side connection 64 communicate with each other via a third concave recess 83, so that the second ring line-side connection 64 also communicates with the first branch-side connection 58 via the transverse bore 84.

[0041] The reverse case is in the Figuren 6d.1 bis 6d.3 , wherein the flow passage through the actuator 44 is effected by a transverse bore 86 passing through the actuator 44. The transverse bores 84, 86 have a smaller diameter than the through bores 80 and 82, respectively.

[0042] In all Figuren 6a.1 bis 6d.3 and Figur 7dMarkings MG for the housing 42 and MS for the actuator 44 are marked on the upper end face of the housing 42 and the actuator 44. These illustrate the pivoting path starting from the operating position according to Figure 6a into the other valve positions according to Figures 6b, 6c and 6d. The first ring line-side connection 62 and the second ring line-side connection 64 communicate with each other via a fourth concave recess 85, so that the first ring line-side connection 62 also communicates with the second branch-side connection 60 via the transverse bore 86.

[0043] The Figur 8 shows the embodiment according to the Figure 6 and 7In one variant, in this embodiment, an expansion element 88 is provided in the flow passage 80, which forms a valve body 90 that interacts with a valve seat 92 provided within the through-bore 80 and the actuator 44. The expansion element 88 can be installed in the area of ​​the supply line 38 to cover the water withdrawal or in the circulation line 40. Bezugszeichenliste

[0044] 2 Cold water line 4 Hot water line 6 Hot water circulation line 8 Wet room 10 Ring main 12 Consumer 14 Outlet opening 16 Inlet opening 18 Shut-off valve (TWC) 20 Shut-off valve (TWW) 22 Transfer point 24 Riser 26 Connecting line 28 Valve 30 Flush valve 32 Delivery point 34 Ring main flush valve 36 Flow resistance element 38 Hot water supply line 40 Hot water circulation line 42 Housing 44 Actuator 46 Swivel axis 48 Valve body 50 Actuating pin 52 First concave recess 54 Second concave recess 56 Housing cover 58 First line-side connection 60 Second line-side connection 62 First ring-side connection 64Second ring line connection 66Flow sections 68Flow sections 70First flow path 72 Flow sections 74 Flow sections 76 Second flow path 78 Bypass path 80 Through hole 82 Through hole 83 Third concave recess 84 Cross hole 85 Fourth concave recess 86 Cross hole 88 Expansion element 90 Valve body 92 Valve seat

Claims

1. Drinking and service water system with a transfer point (22) from the public water supply network, a branch (2, 4), from which at least one ring line (10; 38, 40) provided with at least one consumer (12) branches off, wherein the ring line (10) branches off from the branch (2, 4) via an outlet opening (14) and is returned to the branch (2, 4) via an inlet opening (16), wherein the branch (2, 4) and the ring line (10) are guided in parallel and a flow resistance element (36) is arranged in the branch (2, 4) between the outlet opening (14) and the inlet opening (16), or wherein the ring line (38, 40) is returned to a circulation line (6) via the inlet opening (16), characterized in thatthe outlet opening (14) and the inlet opening (16) and the ring line (10) are connected to a shut-off valve (18, 20) having an actuator (44) which is arranged between the outlet opening (14) or the inlet opening (16) and the ring line (10) provided with the at least one consumer (12).

2. Drinking and service water system according to claim 1, characterized in thatthe shut-off valve (18, 20) has a housing (42) which has a first branch-side connection (58) which communicates with the outlet opening (14), a second branch-side connection (60) which communicates with the inlet opening (16), a first ring-line-side connection (62) and a second ring-line-side connection (64), wherein the ring line (10; 38, 40) is connected to the housing (42) via the ring-line-side connections (62, 64), and the actuator (44) is arranged and designed in the housing (42) such that - in an operating position of the actuator (44) in the housing (42) a first flow path (70) is formed which connects the first branch-side connection (58) to the first ring-line-side connection (62) and a second flow path (76) is formed which connects the second branch-side connection (60) to the second ring line side connection (64);- in a bypass position of the actuator (44) in the housing (42), a first bypass path (78) is formed which connects the first branch-side connection (58) to the second branch-side connection (60) and the first ring-line-side connection (62) and the second ring-line-side connection (64) are blocked; 3. Drinking and service water system according to claim 2, characterized in that the actuator (44) is arranged and designed in the housing (42) in such a way that - in a first one-sided operating position of the actuator (44) the first flow path (70) is continuous and the second flow path (76) is blocked and - in a second one-sided operating position of the actuator (44) the second flow path (76) is continuous and the first flow path (70) is blocked.

4. Drinking and service water system according to one of claims 2 to 3, characterized in thatthe actuator (44) is cylindrical and pivotably received in the housing (44), and that the connections (58, 60, 62, 64) and / or formations of the actuator (44), which form different passages between the connections (58, 60, 62, 64) depending on the position of the actuator (44), are arranged substantially in a plane extending transversely to a pivot axis (46) of the actuator (44).

5. Drinking and service water system according to one of claims 2 to 4, characterized in thatthe actuator (44) is cylindrical and pivotably received in the housing (42), and the actuator (44) has two through-bores (80) arranged one behind the other in a direction extending along the pivot axis (46) of the actuator (44), which through-bores form the first flow path (70) and the second flow path (76), respectively, and / or the first branch-side connection (58) and the second branch-side connection (60) and / or the first ring-line-side connection (62) and the second ring-line-side connection (64) are arranged one behind the other in a direction extending along the pivot axis (46) of the actuator (44).

6. Drinking and service water system according to one of the preceding claims, characterized in thatthe actuator (44) has an expansion element (88) associated with at least one of the flow paths (70; 76), by means of which the flow passage through the corresponding flow path (70, 76) can be throttled as a function of temperature.

7. Drinking and service water system according to one of the preceding claims, characterized in that the first flow path (70) is formed with the nominal diameter of the first branch-side and the first ring-line-side connection (58; 62) and the second flow path (76) is formed with the nominal diameter of the second branch-side and the second ring-line-side connection (60; 64).

8. Shut-off valve for a drinking and service water system according to one of claims 1 to 7, with a housing (42) which has a first branch-side connection (58) which communicates with the outlet opening (14), a second branch-side connection (60) which communicates with the inlet opening (16), a first ring-line side connection (62) and a second ring-line side connection (64), and with an actuator (44) which is arranged and designed in the housing (42) such that - in an operating position of the actuator (44) in the housing (42) a first flow path (70) is formed which connects the first branch-side connection (58) to the first ring-line side connection (62) and a second flow path (76) is formed which connects the second branch-side connection (60) to the second ring-line side connection (64);- in a bypass position of the actuator (44), a first bypass path (78) is formed in the housing (42), which connects the first branch-side connection (58) to the second branch-side connection (60), and the first and the second ring-line-side connections (62; 64) are blocked, and that preferably - in a first one-sided operating position of the actuator (44), the first flow path (70) is continuous and the second flow path (76) is blocked, and - in a second one-sided operating position of the actuator (44), the second flow path (76) is continuous and the first flow path (70) is blocked, and that further preferably - in a ring-line bypass position of the actuator (44), a second bypass path (78) is formed in the housing (42), which connects the first ring-line-side connection (62) to the second ring-line-side connection (64), and the first and the second line-side connection (58; 60) is blocked.; 9. Shut-off valve according to claim 8, characterized in that the actuator (44) has an expansion element (88) associated with at least one of the flow paths (70; 76), by means of which the flow passage through the corresponding flow path (70, 76) can be throttled as a function of temperature.

10. Shut-off valve according to claim 8 or 9, characterized in that the first flow path (70) is formed with the nominal diameter of the first branch-side and the first ring-line-side connection (58; 62) and the second flow path (76) is formed with the nominal diameter of the second branch-side and the second ring-line-side connection (60; 64).

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